You should probably let the script writers know that their scripts are shit so that they can work on improving them rather than just removing them. I doubt that for any paid scripts you can do anything yourself, you'd probably need an admin to do it for you.
It is setup like this for a reason. You paid for a product, this is like buying sponsor and one day realising that you just don't like that cyan colour and want to be put back to normal. What happens when you want the permissions back? The purchase has already been removed from your account.